Abstract
Mast cells (MCs) are critical components of the innate immune system and important for host defense, allergy, autoimmunity, tissue regeneration and tumor progression. Dysregulated MC development leads to systemic mastocytosis (SM), a clinically variable but often devastating family of hematologic disorders. Here we report that induced expression of Lin28, a heterochronic gene and pluripotency factor implicated in driving a fetal hematopoietic program, caused MC accumulation in adult mice in target organs such as the skin and peritoneal cavity. In vitro assays revealed a skewing of myeloid commitment in LIN28B-expressing hematopoietic progenitors, with increased levels of LIN28B in common myeloid and basophil–MC progenitors altering gene expression patterns to favor cell fate choices that enhanced MC specification. In addition, LIN28B-induced MCs appeared phenotypically and functionally immature, and in vitro assays suggested a slowing of MC terminal differentiation in the context of LIN28B upregulation. Finally, interrogation of human MC leukemia samples revealed upregulation of LIN28B in abnormal MCs from patients with SM. This work identifies Lin28 as a novel regulator of innate immune function and a new protein of interest in MC disease.
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Acknowledgements
We thank Cem Akin, Alberto Orfao, Ann Dvorak, David Weinstock, Susan Buchanan, Girijesh Buruzula, Joyce LaVecchio, Atsuya Wakabayashi, Jacobo Ramirez, Elsa Lindhe, Louise Trakimas and Maria Ericsson of the HMS electron microscopy core facility, and the DF/HCC Specialized Histopathology facility for their assistance. This work was supported by a Damon Runyon-Sohn Foundation Cancer Research Fellowship (DRSG 02-12) and a St. Baldrick’s Foundation-PALS Scholar Award (243625; LDW), a Helen Hay Whitney Cancer Fellowship (SD), a Burroughs-Wellcome Fund Career Award (HZ), and grants from the NIH (R01-HL088582 and P30DK036836; AJW), (R01-GM107536; GQD), (K08-CA157727; HZ) and the Ellison Medical Foundation (GQD).
Author Contributions
LDW, TNR, DSP, RGR, GQD, and AJW designed experiments and interpreted data. LDW, TNR, PTN, DSP, JLS, and RGR performed experiments. SD, HZ, and GQD developed and characterized transgenic mice. RCL and DJD provided samples through DFCI Protocol 01-206. LDW wrote the manuscript; LDW, RGR, TNR, DJD, DSP, GQD, and AJW edited it.
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Wang, L., Rao, T., Rowe, R. et al. The role of Lin28b in myeloid and mast cell differentiation and mast cell malignancy. Leukemia 29, 1320–1330 (2015). https://doi.org/10.1038/leu.2015.19
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DOI: https://doi.org/10.1038/leu.2015.19
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